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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Savanna glade hotspots: Plant community development and synergy with large herbivores
Journal of Arid Environments, Volume 78, Year 2012
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Description
In African savannas, abandonment of traditional livestock corrals (bomas) creates long-term mosaics of nutrient hotspots embedded in a lower-nutrient matrix. It is unclear how plant communities develop over time on these sites in clay-rich "black cotton" soils or how herbivores attracted to these sites affect vegetation development. I first examined whether treeless "glades", derived from abandoned bomas, function as nutrient and herbivore hotspots. Soil, vegetation, and herbivore data were collected on glades of varying ages. The results indicated that glades persist as long-term (≥four decades) patches (0.25-1.0 ha) of improved soil texture and increased nutrient levels, palatable grasses, and herbivore use. Glade vegetation also appears to undergo succession from Cynodon plectostachyus to Pennisetum stramineum dominance. Based on these patterns, exclusion cages were used to test herbivore effects on glade vegetation development. I found that large herbivores may retard succession by suppressing invasion of P. stramineum into C. plectostachyus-dominated areas. These results provide evidence that abundant anthropogenic glades function as long-term nutrient and wildlife hotspots in black cotton soils, distinct from similar hotspots in other soil types. The findings provide evidence that large herbivores can exert control over development and persistence of glades through their effects on plant community dynamics. © 2011 Elsevier Ltd.
Authors & Co-Authors
Veblen, Kari E.
United States, Davis
University of California, Davis
Kenya, Nanyuki
Mpala Research Centre
Statistics
Citations: 79
Authors: 1
Affiliations: 2
Identifiers
Doi:
10.1016/j.jaridenv.2011.10.016
ISSN:
01401963
e-ISSN:
1095922X